Final Exam 2 (20%)

Question

A string p is a prefix of a string s if the leading characters of s are identical to p. For example, "abc" is a prefix of "abcde". Develop a function prefix that checks if a C string p is a prefix of another C string s.

p是s的前綴若s開頭的一段字串等於p。例如，"abc"是"abcde"的前綴。寫一個程式 判斷字串p是否字串s的前綴。

Example input 1:

abc
abcde

Example output 1:

abc is a prefix of abcde

 

Example input 2:

bc
abcde

Example output 2:

bc is not a prefix of abcde

 

Answer 1

Hidden content!
  ** ** **** * * *    **
** **   *    ** ****    

int main()
{
  **  * * *  char  ****
 * ** *** *     int i,c=0;
**** ****     * * *   **   **  ***  * ***   ** * * 
*  *  *    *  * **  *  * * * *  *  *  ** * * *
*  *   * * * *  * *  ***  ***    ****
****      * *  {
  ** *    ****** ******      *** * * ***
***** * * * **   ** ** *    *   {
 **  *     *  * *** **       *  *** ** * *** *     **      *   ** * *   
 * * ** ***  *  ****  * *******   ** * * *  **     *  ** *   * ** {
** *                 *******    ** c=0;
* * * *   * *       ***    ** ** *   *** * * *  ** ***   **    ** }
* **** *  ** * **   **          *  ****  ****  else  ***  *** ** * *  * *  ****
 *       **      *   **  **  * ** *  **  * * *** **     * ** **  {
 ******  * *      *  * * *    ****  * ****  ** ****    * ** ** * *  * ** c++;
   * * *  *   **   *  * *     *  *  **  *****   * ** ** *  * }
***   * *   **** *** *    * * *** }
 ****  **   * * * 
    * *  *   **  if(c==0)
 **    *   **  * *****    *   *    *      * is not a prefix of * *  ** ***
****    * ** *  else
**  *   *   * ** **  **  *    *** *  * **    *** is a prefix of  *  *    * * *
**        **** }
***  ***  * **    return 0;
}

Comments

prog.c: In function 'main':
prog.c:8:11: warning: format '%s' expects argument of type 'char *', but argument 2 has type 'char (*)[10]' [-Wformat=]
   scanf("%s",&a);
           ^
prog.c:9:11: warning: format '%s' expects argument of type 'char *', but argument 2 has type 'char (*)[10]' [-Wformat=]
   scanf("%s",&b);
           ^

---

Case 0: Wrong output
Case 1: Wrong output
Case 2: Wrong output

---

Case 0: Correct output
Case 1: Wrong output
Case 2: Correct output

---

Case 0: Correct output
Case 1: Wrong output
Case 2: Correct output

---

prog.c: In function 'main':
prog.c:10:6: warning: implicit declaration of function 'stlen' [-Wimplicit-function-declaration]
   if(stlen(b)>strlen(a))
      ^~~~~
/tmp/ccnE3ufV.o: In function `main':
prog.c:(.text+0x5b): undefined reference to `stlen'
collect2: error: ld returned 1 exit status

---

Case 0: Correct output
Case 1: Wrong output
Case 2: Correct output

---

Case 0: Correct output
Case 1: Wrong output
Case 2: Correct output

---

Case 0: Wrong output
Case 1: Correct output
Case 2: Wrong output

---

Case 0: Correct output
Case 1: Wrong output
Case 2: Correct output

---

Case 0: Correct output
Case 1: Wrong output
Case 2: Correct output

---

Case 0: Wrong output
Case 1: Wrong output
Case 2: Wrong output

---

Case 0: Correct output
Case 1: Correct output
Case 2: Correct output

Answer 2

Hidden content!
* * ****** ***  ** ***
   *  *    *** ** **  * *   
int main()
{
** * * ** *  * ap;
*   * **  * * *  **** *****     *    ****** || ap=a)
    * *  * ****  *** * **    **  *   *** *  is a prefix of abcde\n");
        * *  
** * ***  *
* *   ***** * * *  **  * ** ***** ***     is not a prefix of abcde");
*   ****  *** ***********  ** *     *    ** **   ** * *      * *  *  ***   *    **  0;
* *** ** *   *    *  * ** * *  * **  *  *   **    * *      * *   **** **  ** *  
  

Comments

prog.c: In function 'main':
prog.c:6:10: error: 'a' undeclared (first use in this function)
   if(ap>=a&&ap<=z || ap=a)
          ^
prog.c:6:10: note: each undeclared identifier is reported only once for each function it appears in
prog.c:6:17: error: 'z' undeclared (first use in this function)
   if(ap>=a&&ap<=z || ap=a)
                 ^
prog.c:10:12: warning: missing terminating " character
     printf("bc is not a prefix of abcde);
            ^
prog.c:10:12: error: missing terminating " character
     printf("bc is not a prefix of abcde);
            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
prog.c:11:12: error: expected expression before 'return'
            return 0;
            ^~~~~~
prog.c:12:12: error: expected ';' before '}' token
            }
            ^
prog.c:12:12: error: expected declaration or statement at end of input

---

prog.c: In function 'main':
prog.c:6:10: error: 'a' undeclared (first use in this function)
   if(ap>=a&&ap<=z || ap=a)
          ^
prog.c:6:10: note: each undeclared identifier is reported only once for each function it appears in
prog.c:6:17: error: 'z' undeclared (first use in this function)
   if(ap>=a&&ap<=z || ap=a)
                 ^
prog.c:10:12: warning: missing terminating " character
     printf("bc is not a prefix of abcde);
            ^
prog.c:10:12: error: missing terminating " character
     printf("bc is not a prefix of abcde);
            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
prog.c:11:12: error: expected expression before 'return'
            return 0;
            ^~~~~~
prog.c:12:12: error: expected ';' before '}' token
            }
            ^
prog.c:12:12: error: expected declaration or statement at end of input

---

prog.c: In function 'main':
prog.c:6:10: error: 'a' undeclared (first use in this function)
   if(ap>=a&&ap<=z || ap=a)
          ^
prog.c:6:10: note: each undeclared identifier is reported only once for each function it appears in
prog.c:6:17: error: 'z' undeclared (first use in this function)
   if(ap>=a&&ap<=z || ap=a)
                 ^
prog.c:10:12: warning: missing terminating " character
     printf("bc is not a prefix of abcde);
            ^
prog.c:10:12: error: missing terminating " character
     printf("bc is not a prefix of abcde);
            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
prog.c:11:12: error: expected expression before 'return'
            return 0;
            ^~~~~~
prog.c:12:12: error: expected ';' before '}' token
            }
            ^
prog.c:12:12: error: expected declaration or statement at end of input

---

prog.c: In function 'main':
prog.c:6:10: error: 'a' undeclared (first use in this function)
   if(ap>=a&&ap<=z || ap=a)
          ^
prog.c:6:10: note: each undeclared identifier is reported only once for each function it appears in
prog.c:6:17: error: 'z' undeclared (first use in this function)
   if(ap>=a&&ap<=z || ap=a)
                 ^
prog.c:10:12: warning: missing terminating " character
     printf("bc is not a prefix of abcde);
            ^
prog.c:10:12: error: missing terminating " character
     printf("bc is not a prefix of abcde);
            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
prog.c:11:12: error: expected expression before 'return'
            return 0;
            ^~~~~~
prog.c:12:12: error: expected ';' before '}' token
            }
            ^
prog.c:12:12: error: expected declaration or statement at end of input

---

prog.c: In function 'main':
prog.c:6:10: error: 'a' undeclared (first use in this function)
   if(ap>=a&&ap<=z || ap=a)
          ^
prog.c:6:10: note: each undeclared identifier is reported only once for each function it appears in
prog.c:6:17: error: 'z' undeclared (first use in this function)
   if(ap>=a&&ap<=z || ap=a)
                 ^
prog.c:12:12: error: expected declaration or statement at end of input
            }
            ^

---

prog.c: In function 'main':
prog.c:6:10: error: 'a' undeclared (first use in this function)
   if(ap>=a&&ap<=z || ap=a)
          ^
prog.c:6:10: note: each undeclared identifier is reported only once for each function it appears in
prog.c:6:17: error: 'z' undeclared (first use in this function)
   if(ap>=a&&ap<=z || ap=a)
                 ^
prog.c:12:12: error: expected declaration or statement at end of input
            }
            ^

---

prog.c: In function 'main':
prog.c:6:10: error: 'a' undeclared (first use in this function)
   if(ap>=a&&ap<=z || ap=a)
          ^
prog.c:6:10: note: each undeclared identifier is reported only once for each function it appears in
prog.c:6:17: error: 'z' undeclared (first use in this function)
   if(ap>=a&&ap<=z || ap=a)
                 ^
prog.c:12:12: error: expected declaration or statement at end of input
            }
            ^

Answer 3

Hidden content!
 *        ***   * *    *
  *    *  *** * ***********

char p[1000],s[1000];
int i,pl,sl;

int test(char p[],char s[],int pl, int sl)
{
**    **  *  ***** ** * *     * i<pl; i++)
* ***   **   * ** ***    *** 
 * *  *  * * * *** ***   * ** *****    ***   *  (p[i]==s[i])
*   * **** * * ** **  * *  * ***   **** *     * ** * **
  * **      *   * * * * **    *     **  * **  *****  *     ****** * * **** ** * * * *
  *     ***** **  *   **   ** *  ***  *  * *   *   * * * * ** ** * *** **  ** 
  *   ********   * *  * * * *  ***********  *   * **  *** * ** ** **    * ** ** ***    **   * *   *   **** ** ***** 1;
  ** *  *  *   *   ********** * *   * * *   *** ** *** **    *   *  **** ** 
*      * **   * **   **** * *   * *   *** *  **  *  *
  *** *** **** *  **** ** * *** * **  ** *  *   ***  * if(p[i]!=s[i])
**  * **   * ******   **** *  **  **   **  * * * *
** * ***  *  * ***  * ***  *  ***  *  *   * ** * *   *   *** * * **  *   *  ****       ***   0;
 *     *   *  ***** **   ** * **  * ****   **   *  **   **
 *****   *  ** ***   *  ** **
}


int main()
{
 ***  **   *  **
   * **       *
***   *    **   ** ",p);
  *   * ** ** 
*  ****  *   ****   *  * 

sl=strlen(s);
pl=strlen(p);


   ** *** * *  && pl<sl)
{

*** ** * **    *  **  ***  * **   *  * is a prefix of %s",p,s);
}else
{
printf("%s is not a prefix of %s",p,s);
}





}

Comments

Case 0: Correct output
Case 1: Wrong output
Case 2: Correct output

---

Case 0: Correct output
Case 1: Wrong output
Case 2: Correct output

---

Case 0: Correct output
Case 1: Correct output
Case 2: Correct output

Answer 4

Hidden content!
#include<stdio.h>
#include<string.h>
int main()
{
 ** ******  *** ****  ** *  **   a[99],b[99];
    int l,i;
 * *  *   ** *      ****     ***    **  *
****  ** * * ***  ** ***** *    * ***** 
** **  ****** *    * *    * *  *  
  * *   ****   * **       * *****  *    
    {
   *  *** **  **    **  ** *   *   * ***   *  *   **  ** *   * * *** 
 * *  ***  **   ** *      ***  * *  ** ** **   * ******    * 
 *** * ***  * **  * *  *****      *  ********* *   **        ** * **** * ***  **** * *  **    a prefix of %s",a,b);
**    *   * *  *  * *    *    ***  ** * * **    *  * *  * ** *  **  ** *  * 
***** * **** * *** *    *    *    *  **** ** ****  *   * 
* ** * ***           * ** * **  *  **   * *  *  * * *  **  *** 
* *   ** * **  ***  * *  * *  *  * *     ****   **     **
* *  *     * ***  *  ** ** * *** *** ******  *     *   **  ******   ** **  **   *     * *  *  * **    not a prefix of %s",a,b);
*   **  ** * *  * *  **   *   **  ****   **    **** * ***  *   ***   * *  * * ** * ******* *  *
   *  *  *     *   *** * ***  *** ** ****** **   *  * **
    }


}

Comments

Case 0: Wrong output
Case 1: Wrong output
Case 2: Wrong output

---

Case 0: Wrong output
Case 1: Wrong output
Case 2: Wrong output

---

Case 0: Wrong output
Case 1: Wrong output
Case 2: Wrong output

Answer 5

Hidden content!
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>

int prefix(char a[100],char b[100]);


int prefix(char a[100],char b[100])
{
* **     * *** * ** * * *  * * i;
* **       *****  *** ** * * count=0;
 *****  * ***        ****** **   len;

*** *       ****    * *** ****   * **   *

 *  *  ******* *  * *** *    * *  *      *
       **  *  *   * ** ** ** * 
* ** *** **** **** **  ** **   ****  **    * *     *  * **
*  *   ***** ****    *** * *   *  *  ** * *  * ****  **
***** * ** *      *  ****  ** *** ** * **  * *   *     * ** *****  **   ***   * *    ** **
 **        *  * ***  **** *     ****    *     **     
  ** ** * *     **   * *****


***    ***  ** **   * **  * * *      ** * 
  * **** **   * ** *  ** * *  
*  * ***   *** *   ***     *  *  *  ** *  *******   * 1;
* **  * *   *   *  **  * *   *
 *  ** **  ****   ** *  *  * 

   return 0;
}


int main()
{
***  *** ** *****   **  ***      a[100];
   *** * *** ****        * **  * * b[100];


 **  ****   * *   * **** *****    ***  **   * *   *      **
 *  ***    *  *     ** *   ** ****     **   * ** * **  *  *

**  * *        **** * * *  ** *     ** *
  *  ** ** *  * * **   ** *        *  *

      * *     *   ****   *******  **

 {
** ***  * **** ** *  **   ***  * ** ** * *** * * * *  **       *** *  is a prefix of %s",a,b);
**   *       * *   *   **  *  * 
   *   *** ** *        *   **  
 * **    ***      * * *  **   *
*** *     *   ** *      *    **  ***   *** **  *  *  *****       ****    *  * **    is not a prefix of %s",a,b);
  ***  **   *****   * ***   *   


*  ** ******* *   * *   * *** 0;
}

Comments

prog.c: In function 'main':
prog.c:45:15: warning: format '%[^
   ' expects argument of type 'char *', but argument 2 has type 'char (*)[100]' [-Wformat=]
     scanf("%[^\n]*c%",&a);
               ^
prog.c:45:20: warning: spurious trailing '%' in format [-Wformat=]
     scanf("%[^\n]*c%",&a);
                    ^
prog.c:46:15: warning: format '%[^
   ' expects argument of type 'char *', but argument 2 has type 'char (*)[100]' [-Wformat=]
     scanf("%[^\n]*c%",&b);
               ^
prog.c:46:20: warning: spurious trailing '%' in format [-Wformat=]
     scanf("%[^\n]*c%",&b);
                    ^

---

Case 0: Wrong output
Case 1: Wrong output
Case 2: Wrong output

---

Case 0: Wrong output
Case 1: Wrong output
Case 2: Wrong output

Answer 6

Hidden content!
 **     * **** * * 
  ** *  *  **     *     ***

int *
{
 * ** * ***   * *  * * ** ***   * no idea, I  *  even do it in the *  ** *** *   * ***
 ** *  *** ** ***  *   **     * 0;
}

Comments

Case 0: Wrong output
Case 1: Wrong output
Case 2: Wrong output

Answer 7

Hidden content!
#include  *  *     * * *  **
#include  *    ** *   *
#include * *     ** * 

int pref(char[],char[]);

int main(){

  *  * * *** * *  ***   *** ** p[10],s[10];
* ** *  * ***** ** *  ** **   num;

   *  ** **** ****  ** *  ****  
  * *** * ***   * ***   * **  
*  *  * ** *** *  * * * *** **  *    ** * * * * *  ** *    
* ***  **  * * **  ** *   *       ***  *   ** **** ** 

******  **  * *  *   * **** **** = pref(p,s);

 *   ** ** **   *  * **     ** *** **
*** *  *** * *  *   *  *   ** *** **   *       * ** *   * **  *  *   **** is a prefix of %s",p,s);
   *    *** **  * **   **    **  *
**** *   **  * * ** *** **   **     ***  ** ****  * ****  *  *  * is not a prefix of %s",p,s);


 return 0;
}

int pref(char p[30],char s[30]){
 **  ***   * ** *  *  ** *** i;

 *  * *****   ** * *  ** *  * *  **  **** *  ** *
*********  * *** ** *    * *  *   ***   **** ** * * ******* * * * ****  ** * * *  *  ***** * * *** **** *   *  ***
        * *     * ** ***     *      ** * **     *  *  *   *  * ********   **** *  * *  *** is a prefix of %s",p,s);
 ** * ****  *     * *  *    *      * ** * * *  ** ** **  *
**   * **  ** ** * *  * **     *         *** *   * * * ** *  *** **  ** *   * ** **   **    **** **   ***** is not a prefix of %s",p,s);

 **    * ** ** *  ** * ** *  

}

Comments

prog.c: In function 'main':
prog.c:12:5: warning: 'gets' is deprecated [-Wdeprecated-declarations]
     gets(p);
     ^~~~
In file included from prog.c:1:0:
/usr/include/stdio.h:640:14: note: declared here
 extern char *gets (char *__s) __wur __attribute_deprecated__;
              ^~~~
prog.c:13:5: warning: 'gets' is deprecated [-Wdeprecated-declarations]
     gets(s);
     ^~~~
In file included from prog.c:1:0:
/usr/include/stdio.h:640:14: note: declared here
 extern char *gets (char *__s) __wur __attribute_deprecated__;
              ^~~~
/tmp/cc0tBG5r.o: In function `main':
prog.c:(.text+0x1f): warning: the `gets' function is dangerous and should not be used.

---

prog.c: In function 'main':
prog.c:10:13: error: stray '#' in program
     int num;#include <stdio.h>
             ^
prog.c:10:14: error: 'include' undeclared (first use in this function)
     int num;#include <stdio.h>
              ^~~~~~~
prog.c:10:14: note: each undeclared identifier is reported only once for each function it appears in
prog.c:10:23: error: 'stdio' undeclared (first use in this function)
     int num;#include <stdio.h>
                       ^~~~~
prog.c:14:1: error: expected expression before 'int'
 int pref(char[],char[]);
 ^~~
prog.c: In function 'main':
prog.c:23:13: warning: format '%s' expects argument of type 'char *', but argument 2 has type 'char (*)[10]' [-Wformat=]
     scanf("%s",&p);
             ^
prog.c:24:13: warning: format '%s' expects argument of type 'char *', but argument 2 has type 'char (*)[10]' [-Wformat=]
     scanf("%s",&s);
             ^
prog.c: In function 'main':
prog.c:51:5: warning: 'gets' is deprecated [-Wdeprecated-declarations]
     gets(p);
     ^~~~
In file included from prog.c:1:0:
/usr/include/stdio.h:640:14: note: declared here
 extern char *gets (char *__s) __wur __attribute_deprecated__;
              ^~~~
prog.c:52:5: warning: 'gets' is deprecated [-Wdeprecated-declarations]
     gets(s);
     ^~~~
In file included from prog.c:1:0:
/usr/include/stdio.h:640:14: note: declared here
 extern char *gets (char *__s) __wur __attribute_deprecated__;
              ^~~~

---

prog.c: In function 'main':
prog.c:14:13: warning: format '%s' expects argument of type 'char *', but argument 2 has type 'char (*)[10]' [-Wformat=]
     scanf("%s",&p);
             ^
prog.c:15:13: warning: format '%s' expects argument of type 'char *', but argument 2 has type 'char (*)[10]' [-Wformat=]
     scanf("%s",&s);
             ^

Answer 8

Hidden content!
   * * *** ***   *** * 
    *    *** **** *****

int main()
{
   * **** * length1,  *    c;
  ** *** ** a[100];
** * ***** b[100];
 ** *** * d[100];

    * **   ***** **   *  *** **     ** **
*  ** * **   *** ** *   **     * * 

   * ** * ** *** * * *

  ** * *   **   * ***

*** *     *** *  
**  * *
  ****** ***   *    * * **** is a prefix of    *  * *  *
 ** * * 
 *** ****         * 
*  *  *  
 ***  ** ***     *** * is not a prefix of   * **  *
  * ** 

}

Comments

prog.c: In function 'main':
prog.c:11:10: warning: format '%s' expects argument of type 'char *', but argument 2 has type 'char (*)[100]' [-Wformat=]
  scanf("%s",&a);
          ^
prog.c:12:10: warning: format '%s' expects argument of type 'char *', but argument 2 has type 'char (*)[100]' [-Wformat=]
  scanf("%s",&b);
          ^
prog.c:24:11: warning: format '%s' expects a matching 'char *' argument [-Wformat=]
  printf("%s is not a prefix of %s,a,b");
           ^
prog.c:24:33: warning: format '%s' expects a matching 'char *' argument [-Wformat=]
  printf("%s is not a prefix of %s,a,b");
                                 ^

Answer 9

Hidden content!
*  ****** *  **   *
 **** * *  ** * **  * 

int main()
{
  *** *** *  ** **    *** *  str;
 * *  * **   * *   *   ***  i, p, s;

**  ** *    * ** **   **   *   * **  *  * **** &p, &s);

* ****  **** ***  *  ** ** **  (i<=0; &p; i++);
   **** * **** *    ** * ***  **  *
* *   **  ******** ****** *****  * **   ** **    * &p);
* **  *   **   **  **   **  *** * *  *    *  *
**   *** ** *    * * **   *     
 ** ** *  * * ** *       

 *  * ** * ******* *   *** *  **  0;
}

Comments

prog.c: In function 'main':
prog.c:12:7: error: expected '(' before '{' token
     if{}
       ^
prog.c:13:12: warning: too many arguments for format [-Wformat-extra-args]
     printf("abc", &p);
            ^~~~~
prog.c:14:13: warning: format '%d' expects a matching 'int *' argument [-Wformat=]
     scanf("%d");
             ^

Answer 10

Hidden content!
**   ** **   *  * 
*** **  *** **** ** * * *
int main (){
char       **  * 
char ****** **
***   **   *    ** *  **     * * *
 * * ** ** * *   * *  * ***  *
** *   *    * **     ******
***   * ** ** *   *  **   ** *
*   *   ***** *** **
    *****  **  is a prefix of * *  *  * **
}
else{
*  *      ** is not a prefix of %s  * **   * * ** ***
}
*  * 0;
}

Comments

prog.c: In function 'main':
prog.c:7:9: warning: format '%s' expects argument of type 'char *', but argument 2 has type 'char (*)[100]' [-Wformat=]
 scanf("%s",&string1);
         ^
prog.c:9:9: warning: format '%s' expects argument of type 'char *', but argument 2 has type 'char (*)[100]' [-Wformat=]
 scanf("%s",&string2);
         ^